Wireless EV Charging Alignment Using Sense Coil Time Slots
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Solution Overview
Problem
Existing wireless inductive charging systems for electric vehicles face challenges in accurately determining the position of the vehicle relative to the charging unit due to the requirement for synchronization between magnetic field detection and generation systems, leading to alignment issues and reduced efficiency.
Innovation Solution
The implementation of a system using a plurality of sense coils that generate signals under the influence of an alternating magnetic field, with a processor determining the relative position of the wireless power transmitter from the receiver based on these signals, employing techniques such as time-division or frequency-division multiplexing to resolve position ambiguity and achieve synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field detection and generation systems are used for position determination, then wireless charging alignment can be achieved, but signal polarity and position ambiguities arise leading to reduced accuracy
Solution Approach 1:
The system uses periodic wave pulses transmitted in sequential time slots to encode position information. The alternating magnetic field is generated in periodic cycles, with each cycle containing multiple time slots that carry different spatial encoding information. This periodic structure allows the receiver to distinguish between different positions and resolve ambiguities by analyzing the temporal pattern of received signals across multiple cycles.
Solution Approach 2:
The magnetic field detection is segmented into multiple sense coils arranged in specific spatial configurations. Each sense coil detects magnetic field components in different directions or at different locations. By segmenting the detection system into multiple independent sensing elements, the system can resolve position ambiguities through spatial differentiation and determine the complete relative position between transmitter and receiver.
2Measurement precision
If synchronization methods are implemented to resolve position ambiguity, then measurement accuracy improves, but system complexity increases
Solution Approach 1:
The system uses self-service synchronization where the receiver autonomously synchronizes to the transmitted wave pulses without requiring an external synchronization signal. The receiver detects the periodic structure of transmitted pulses and automatically aligns its detection window to the correct time slots. This self-synchronization mechanism reduces system complexity by eliminating dedicated synchronization hardware while maintaining accurate position determination.
Solution Approach 2:
The system implements feedback-based synchronization where the receiver analyzes the received magnetic field signals and adjusts its detection timing based on the detected pulse patterns. The processor uses the periodic structure of received signals to automatically synchronize the detection windows with transmitted time slots, creating a closed-loop synchronization system that adapts to actual transmission conditions without requiring complex external control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of vehicle positioning and alignment, improving the efficiency of wireless charging by resolving signal polarity and position ambiguities, allowing for precise alignment and efficient power transfer.
Implementation Method 1
a plurality of sense coils, each configured to generate a respective signal under influence of an alternating magnetic field
Data Source
AI summary
An apparatus for determining a relative position of a wireless power transmitter from a wireless power receiver is provided. The apparatus comprises a plurality of sense coils, each configured to generate a respective signal under influence of an alternating magnetic field comprising a plurality of wave pulses, each wave pulse occurring in a respective time slot of a plurality of time slots. The apparatus further comprises a processor configured to determine the relative position of the wireless power transmitter from the wireless power receiver based on the respective signal from each of the plurality of sense coils.